Seems like there's always a few guys each year who at least run an unofficial 4.2 on someone's clock, even if it doesn't end up recorded as their official time. I don't have a list of names to throw out, but part of me thinks Cordarrelle Patterson could break the 4.3 barrier. I can't really guess for defensive backs. Denard Robinson? I think of Tavon Austin when I think of really fast players, but he might fall into the "more quick than fast" category. He's definitely one of the fastest short-area players in the draft, but I really don't know if I should expect him to run 4.45 or 4.30.